Superplasticizer – Data For ICI – Technical Committee on Admixture G.Sivakumar 25 Oct 2014 Page 1 of 7 Trial Mix Details Physical requirements verification for Super-plasticizers ASTM C 494 & IS 9103 Water reduction efficiency Strength Setting Time Air Content Bleeding Could be suggested - Slump retention for all slump range Criteria for material selection used in trial mixes – to limit the variations Cement shall be fresh and free from lumps River sand as fine aggregate falling in Zone II 75micron passing in wet sieve shall not exceed 1% by weight Coarse Aggregate grading from 20mm to 4.75 shall comply with the limits given as per IS 383 Limits for Flakiness and Elongation Index are suggested as follow; - Flakiness less than 15% - Elongation less than 15% - Combined Flakiness and Elongation less than 25% Grading of All in Aggregates shall comply with the limits given as per IS 383 Water for Construction purpose conforming to the requirements of IS 456 Raw Materials shall be obtained from the same pool of samples for both reference mixes and mixes with admixture in order to control the variables. Moisture and absorption corrections shall be verified and effected Criteria for trial mixes Two different Cement content, 310 kg/cum for MRWR Admixture and 350 kg/cum for HRMR, can be used as given in the reference trial mixes. The reason is that the mix used to evaluate HRMW admixtures like PCE based one would require a cement content more than 310 kg/cum for better dispersement of admixture and rheology of the mix. Air content of 2% can be assumed as 20mm nominal maximum size aggregate is used in the trial mixes, though IS10262 does not mention about air content. Verification of early age cube compressive strength can be helpful to gauge the hardening of concrete.
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Superplasticizer – Data
For ICI – Technical Committee on Admixture
G.Sivakumar 25 Oct 2014 Page 1 of 7
Trial Mix Details
Physical requirements verification for Super-plasticizers
� ASTM C 494 & IS 9103
� Water reduction efficiency
� Strength
� Setting Time
� Air Content
� Bleeding
Could be suggested - Slump retention for all slump range
Criteria for material selection used in trial mixes – to limit the variations
� Cement shall be fresh and free from lumps
� River sand as fine aggregate falling in Zone II
� 75micron passing in wet sieve shall not exceed 1% by weight
� Coarse Aggregate grading from 20mm to 4.75 shall comply with the limits given as per IS 383
� Limits for Flakiness and Elongation Index are suggested as follow;
- Flakiness less than 15%
- Elongation less than 15%
- Combined Flakiness and Elongation less than 25%
� Grading of All in Aggregates shall comply with the limits given as per IS 383
� Water for Construction purpose conforming to the requirements of IS 456
� Raw Materials shall be obtained from the same pool of samples for both reference mixes and
mixes with admixture in order to control the variables.
� Moisture and absorption corrections shall be verified and effected
Criteria for trial mixes
� Two different Cement content, 310 kg/cum for MRWR Admixture and 350 kg/cum for HRMR,
can be used as given in the reference trial mixes. The reason is that the mix used to evaluate
HRMW admixtures like PCE based one would require a cement content more than 310 kg/cum
for better dispersement of admixture and rheology of the mix.
� Air content of 2% can be assumed as 20mm nominal maximum size aggregate is used in the trial
mixes, though IS10262 does not mention about air content.
� Verification of early age cube compressive strength can be helpful to gauge the hardening of
concrete.
Superplasticizer – Data
For ICI – Technical Committee on Admixture
G.Sivakumar 25 Oct 2014 Page 2 of 7
Physical Properties verification for Superplasticizing Admixture – Mid Range
Control Mix Mix with SNF based SP
Material Design Design
OPC 310 310
20 to 4.75 mm 1091 1105
River Sand 833 868
Water 192 168
SNF based MRWR SP 0 2.7 (@ 0.89%
Total 2426 2451
Yield 980 litres 980 litres
Ambient Temperature 32.8°C 32.2°C
Concrete Temperature 31.0°C 31.0°C
Slump Measurement
Initial 100 mm 100 mm
@ 60 minutes 65 mm 70 mm
Cube Compressive strength
17 hours 9.3 MPa 5.5 MPa
3 day 20.7 MPa 28.9 MPa
7 day 26.0 MPa 37.5 MPa
28 day 35.3 MPa 43.2 MPa
Water Reduction Efficiency NA ((192-168)/192) X 100 = 12.5%